bottglas



H. A. DOUGLAS.

REFLECTING ELECTRFC LAMP.

APPLlCATION FILED NOV. 2% :91].

Patented Aug. 19, 1919,

2 SHEETS-SHEET 1. 292.

.7 v fiafi/w H. A. DOUGLAS.

REFLECTING ELECTRIC LAMP.

APPLICATION FILED NOV-21.1917.

Patented Aug". 19, 1919 2 SHEETS SHEET 2.

A. DOUGLAS.-, BRONSON, MICHIGAN, ASSIGNOR TO DOUGLAS 85 RUDD 'MFG. (30.,

OLE BRONSON, MICHIGAN, A CORPORATION OF MICHIGAN.

REFLECTING ELECTRIC LAMP.

Application filed November 21, 1917.

ii) aZZ whom. it may concern.

Be known that I. HARRY A. DOUGLAS, citizen of the United States, residing at Bronson, in the county of Branch and State of lliichigan, have invented a certain new .jl useful Improvement. in Reflecting- Electric Lamps, of which the following is a full, clear, concise, and e :act description.

invention relates to reflecting electric lamps and has for its general object-the provision of improved means for assembling component parts thereof.

A reflecting lamp made in accordance with my invention includes a reflector containing casit a lamp, two tubular elements, one u hin'the other, one receiving the lamp and 1. rrounded hy the other that is connected wih the casing, an integral portion of one of said tubular elements constituting a. eicumferentially extending spring formation that bears upon the other tubular element to hold. it. The outei' tu bular element is the one that desirably has the circun'ifercntially extending spring formation and this spring formation is desirably inclusive of two nnpt itely directed circumferentially or 18nd alined springs. The circu erentially extending" sprinqs not only perform the function for which these springs are provided but these springs also constitute continuing parts of the tubular element havingthem. By extending these springs circumferentially instead of longitudinally the portion of the tubular element in. which they are provided need not he as long, for a given degree of spring pressure, as would he necessary if the springs extended longitudinally. Moreover, the outer ends of the springs are, in the preferred embodiment of the invention,

separated sufficiently to form a longitudinal slot in the tubular element having the springs, the other tubular element having a lateral formation in abutting and sliding engagement with the aforesaid outer ends of the springs to prevent relative rotation of the tubular elements while permitting heir relative longitudinal movement for se of focusing the lamp. The i rve to hold the inner tubular a l alinement with the outer do not tend towarp ubular element. 3

y invention more fully accompanying drawings 4 is a view on line H of Specification of Letters Patent. Patented Aug, 1%, 1919,,

Serial No. 203,099.

showing the preferred embodiments thereof and in which Figure 1 is view, partially in longitudinal section and partially in elevation, showing portions of a reflecting lamp made in accordance with theinven tion; Fig. 2 is a view on line 2-2 of Fig. 1; F ig. 3 is a bottom view, excepting for the reflector which is shown in section, of the structure as it appears in Fig. 1; Fig. Fig. 3; Fig. 5 shows, partially in section and partially in elevation, modification of the structure shown inFig. 1; Fig. 6 is a view'on line 66 of Fig. 5; Fig. 7 shows, partiallyrin section and partially modification; Fig. 8 is a view on line 88 of F ig, 7; F ig. 9 shows another modification, artially in section and partially in elevation; Fig. 10 is a side view of a partof the structure shown in Fig. 9; and Fig. 11 is a view on line 111l.of Fig. 9.

Like parts are indicated by similar characters of reference throughout the different figures.

Reference will first be made to'the construction shown in Figs. 1 to I inclusive.

The reflector containing casing i has a reflector provided directly upon its front face in the construction shown in these figures. The base of the lamp 2 is provided with bayonet pins 3 that are received within the bayonet slots 4: provided in the forward end of the inner tubular element or shell 5. The lamp filament 6 is connected with the contacts 7 upon the base of the lamp. A plug 8 is the shell '5 and is suitably coupled witli s aid shell. This plug carries forwardly spring pressed contacts 9 that are engageable with the contacts 7 upon the base of the lamp that is received in the front end of the shell. The outer tubular element 10 is coupled with the casing 1 and constitutes a' holder for the shell 5 whereby said shell and lamp are assembled with the casing 1. The holder or outer tubular element 10 is provided, with in elevation, another received within the rear end of.

a circumferentially extending slot 11 at the integrallyformed with the balance of the holder, two alined circumferentially extending oppositely directed springs 13, The

inner, tubular element or shell 5. is formed base thereof" afi'ord atleast three "points,

within the holder is permitted whereby the l mgp may be focally adjusted with respect to e reflector on the front face of the easin 1. The two s )rin s 13 and the common distributed around the circle of the shell, where the holder 10 has holding engagement therewith and as the shell is in slid ing tit with the holller inclosing it the spring portions 13 of the holder not only serve to maintain the shell and holder in assembly but do not tend to throw the shell out of axial alinement, with the holder. The rear holder extensions l3 prevent the shell 11 from being rearwardly removed.

The construction shown in Figs. lifand 6' has many points in common with the construction shown in Figs. .1 to 4 inclusive and similar parts are given similar characters of reference.

In Fig. 5 the reflector containing casing 1 is spaced apart from the reflector 15 contained therein in which event the shell 5 is provided with some suitable adjusting means that extends through the back of the casing, it being understood that said casing is connected or tlSSQIl'lblQd with the reflector 15 and thereby with the holder 10. I have shown an angular lug 16 in fixed connection with'the shell 5 and in threaded engagement with a screw 17 whose head 18 is upon the exterior of thecasing. r This screwy i is confined to a single plane of rotation so alined that as itis turned the shell is moved backwardly or forwardly to effect the focal adjustment of the lamp. Instead of providing the projections 14 to limit the rotation of the shell within the holder, Iemploy a bulge 19 inthe shell 5 that performs this function and which also serves to hold the angular lug in position between the plug 8 and the shell whereby the assembly of the lug and In the" construction illustrated in Figs. 7 and 8 there are shown parts similar. to parts shown in Figs. 1 to 4 inclusive and these parts are givensimilar characters of reference. In these Figs. 7 and 8 there are illustrated two circumferentially extending slots 20 in the rear portionvot the shell 5 rather than in the inclosing holder 10 and spaced apart longitudinally of the shell. The shell 5 also has a longitudinally extending slot 21- that joins theslots 20 to form two i'rcumferentiaHQ extending oppo sit'ely di 'ected :springs .22. The holder 10 may be moved forwardly of the springs 22 whereby relative rotary movement of the shell and holder are pre Vented. The longitudinal edges of the slot 23 in the holder 10 also have sliding engagement with the outer ends of the springs whereby the shell 5 may be adjusted longitudinally of the holder 10 to etl'ect t'ocal adjustment, of the lamp. The plug 8 has a rearward extension in the form of a threaded rod 24 which is in threaded connection with a rotatable sleeve 25. This sleeve 25 is mounted within the rear end of the holder 10 that extends to the rear of the casing 1 and is coupled therewith as illustrated. The sleeve 25 is confined to a single plane of rotation so that as it is turned the rod'24 and the plug 8 to which the rod-is attached are movable backwardly and forwardly to effect focal adjustment of the lamp..

In the arrangement shown in Figs. 7 and 8 portions 22, In addition to taking part in forming the lamp receiving shell 5, also form springs that press outwardly upon the surrounding holder 10.

The construetion'sho'wn in Figs. 11 has a number of'characteristics'in common with the construction shown in Figs. 1, 2', 3 and '4, the holder 10' in both constructions having circumferentially disposed springs formed therein. The construction shown in Figs; 9, 10 and 11 also has a number of features in common with the construction shown in Figs. 7 and 8 but differs from the constructionshown in Figs. 7 and 8 as these latter figures .show the' circumferentially disposed springs formed in the shell that holds the lampv base at its front and the plug at its rear. v The parts ofthe structure shown in Figs. 9, 10 and 11 which are similar to parts shown'in the other figures are given similar 10and which springs are provided with noses 13 that-enter the slot'5 Relative] circumferential movement of the holder and shell is prevented by the engagement of the noses 13 with the longitudinal margins of the slot 5 Movement of the shell longitudinally of the holder is permitted by melt-- longer than the width of the The extent to which-the shell ing the slot 5' springs 13%.

j is limited by the engagement of the rear edge of the slot' 5 with the noses 13 The extent to which the shell may be moved'rearwardly is limited byflthe engagement of the forward edge of "the slot 5 with the noses 13.

9, 10 and Another riifierence between the structure of Figs. 9 to 11 incl 'ive and the structure in Figsfii Ito 4i inolusi ve resides in the fact that the slot that separates ihe adj scentends of the springs 13 does not extend to the rear of the holder since the hoider extends too fin to the rear for such elongation of the s oi.

In all forms of the invention the ciroumierentielly olineci oppositely directed springs serve to engage the tubular element complementnl to the tubular element having ii-hose springs so senior and maintain in niinemens the tubular elements Without re- :iuiring increase in the lengths of the tubuhir eiemezits having the splin s in order that rho springs grie perform their func- HUDS- described the preferred embodiment n; invention, I do not, wish to be limited precise oetails of construction shown may read ly be made Without cie- 1W rom the spirit of my invention, but

"as new and desire tosecure by Letters Pat While; 1 have heroin shown and particunormally preveni relative longieuliiin-i and sliding engagement with the outer ends of said springs to prevent releiive rotation of the tubular elements and to permit focal adjustment of the lamp.

2. A reflecting electric lamp inoluding u, 45

reflector containing casing; a lamp; and two tubular elements one within the other one receiving the lamp and surrounded by the other that is connected with the casing, one

of said tubular elements having; cirouin- 5o ferentially extending; sloi; and a longiiudinul slot communicating with the other slot, these slots forming two elined cireumiererv tialy exizenfiing -oppositely directed springs that bear upon the other tubular which is formed to have abutting sna l slid-- ing engagement withthe outerencls of sairi sprin s to prevent relative rotation o the tubular eiernents ami to permit forei adjust ment or the lump 3. A. reflecting electric innip including reflector ooniaining casing; a lamp; tubular eiemenis, one Within one! moi sole longitudinally of the other, one; reneiving the lamp and surrounded by the one film is connected with the casing, one of said tubular elements having" a ciroumferentiolly' extending slot and u longimdinei slot oon1- inunicuting with the owner slot *hese sioiis forming a circumferential? exrer i that bears upon the other tuhuier sis-menimovement between said mm? P and means preventing relnili e terry movement of said, tubuier While permitting one of these move iongitudinally of the other,

In Witness whereof l hereunto suhsorihe myvzmme this 8th of New, i3, 191?. filillniir DQUGLAS. 

